diff --git a/Dockerfile b/Dockerfile
index fd85a45..ed8265d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ WORKDIR /app
 COPY requirements.txt .
 RUN pip install -r requirements.txt
 
-FROM node:12-alpine AS app-base
+FROM node:12-alpine@sha256:d4b15b3d48f42059a15bd659be60afe21762aae9d6cbea6f124440895c27db68 AS app-base
 WORKDIR /app
 COPY app/package.json app/yarn.lock ./
 COPY app/spec ./spec